[PATCH v1 0/5] target/arm: Handle psci calls in userspace

[Shaoqin Huang]

The userspace SMCCC call filtering[1] provides the ability to forward the SMCCC
calls to the userspace. The vCPU hotplug[2] would be the first legitimate use
case to handle the psci calls in userspace, thus the vCPU hotplug can deny the
PSCI_ON call if the vCPU is not present now.

This series try to enable the userspace SMCCC call filtering, thus can handle
the SMCCC call in userspace. The first enabled SMCCC call is psci call, by using
the new added option 'user-smccc', we can enable handle psci calls in userspace.

qemu-system-aarch64 -machine virt,user-smccc=on

This series reuse the qemu implementation of the psci handling, thus the
handling process is very simple. But when handling psci in userspace when using
kvm, the reset vcpu process need to be taking care, the detail is included in
the patch05.

[1] lore.kernel.org/20230404154050.2270077-1-oliver.upton@linux.dev
[2] lore.kernel.org/20230203135043.409192-1-james.morse@arm.com

Shaoqin Huang (5):
  linux-headers: Update to v6.4-rc7
  linux-headers: Import arm-smccc.h from Linux v6.4-rc7
  target/arm: make psci call can be used by kvm
  arm/kvm: add skeleton implementation for userspace SMCCC call handling
  arm/kvm: add support for userspace psci calls handling

 docs/system/arm/virt.rst                      |   4 +
 hw/arm/virt.c                                 |  21 ++
 hw/intc/arm_gicv3_kvm.c                       |  10 +
 include/hw/arm/virt.h                         |   1 +
 include/standard-headers/linux/const.h        |   2 +-
 include/standard-headers/linux/virtio_blk.h   |  18 +-
 .../standard-headers/linux/virtio_config.h    |   6 +
 include/standard-headers/linux/virtio_net.h   |   1 +
 linux-headers/asm-arm64/kvm.h                 |  33 +++
 linux-headers/asm-riscv/kvm.h                 |  53 +++-
 linux-headers/asm-riscv/unistd.h              |   9 +
 linux-headers/asm-s390/unistd_32.h            |   1 +
 linux-headers/asm-s390/unistd_64.h            |   1 +
 linux-headers/asm-x86/kvm.h                   |   3 +
 linux-headers/linux/arm-smccc.h               | 240 ++++++++++++++++++
 linux-headers/linux/const.h                   |   2 +-
 linux-headers/linux/kvm.h                     |  12 +-
 linux-headers/linux/psp-sev.h                 |   7 +
 linux-headers/linux/userfaultfd.h             |  17 +-
 target/arm/helper.c                           |   3 +-
 target/arm/kvm.c                              | 146 +++++++++++
 21 files changed, 573 insertions(+), 17 deletions(-)
 create mode 100644 linux-headers/linux/arm-smccc.h

base-commit: e3660cc1e3cb136af50c0eaaeac27943c2438d1d
-- 
2.39.1